Адаптивное меню при помощи CSS + jQuery

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>

<header class="adaptivno_peganes">
  <div class="logotype">
  <a href="#">ZORNET.RU</a>
  </div>
<a href="#peganes" class="asumobile_devices" id="asumobile_devices" role="button" tabindex="0"><span>Menu</span></a>
  <div class="mobile-peganes"></div>
  <nav id="peganes" class="peganes">
  <a href="#" class="menyushka">Файлы</a>
  <a href="#" class="menyushka">Дизайн</a>
  <a href="#" class="menyushka">Скрипты</a>
  <a href="#" class="menyushka deysa_sukema">Контакты</a>
  </nav>
  </header>

a {
  text-decoration: none;
}

:root {
  --master-color: #5590af;
  --master-color-partner-dark: #1d3e7c;
  --master-color-partner-bright: #94b2e0;
  --main-txt-color: #353333;
  --headings-color: #263358;
  --link-color: #705b9e;
  --sub-color: #9c9797;
  --main-bg-color: #ffffff;
  --secondary-bg-color: #2b2626;
  --content-padding: 1.5em;
}

body {
  font-family: 'Roboto', Tahoma, sans-serif;
  font-size: 125%;
  font-style: normal;
  background: var(--main-bg-color);
}

html, body { height: 100%; }  

.adaptivno_peganes {
  display: flex;
  flex-flow: row nowrap;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--content-padding);
  position: relative;
  background-color: rgb(255, 255, 255);
}

.logotype {  
  flex: 3 1 auto; /* 3 part from 10 */
  line-height: 2em;
}

.logotype a {
  font-size: calc(32px + (35 - 16) * (100vw - 470px) / (1920 - 470));
  font-weight: 700;
  font-style: normal;
  display: inline-block;
  color: #414d6f;
  -webkit-transition: color .5s;
  transition: color .5s;
}

.logotype a:hover {
  color: rgb(65, 121, 150);
}

.peganes {
  flex: 7 1 auto;  
  display: flex;
  flex-flow: row wrap;
  justify-content: space-between;
}

.menyushka {
  font-size: 1em;
  font-weight: 500;
  line-height: 2em;
  text-align: center;
  color: #4c4949;
  position: relative;
  overflow: hidden;
}

.deysa_sukema {
  color: #296686;
}

.menyushka:after {
  content: '';
  display: block;
  width: 100%;
  height: 2px;
  position: absolute;
  bottom: 3px;
  left: -100%;
  background: var(--master-color);
   
  -webkit-transition: all .2s ease-out;
  transition: all .2s ease-out;
}

.menyushka:hover:after {
  left: 0;
}

.asumobile_devices {
  z-index: 300;
  height: 1.2em;  
  width: 1.8em;
  border: none;
  text-align: center;
  -webkit-transition: all .3s ease-out;
  transition: all .3s ease-out;
  position: relative;
}

.asumobile_devices span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--master-color);
  position: absolute;
  top: 50%;
  text-indent: -9999px;
  letter-spacing: -5px;
  text-align: left;
   
  -webkit-transition: all .3s ease-in-out;
  transition: all .3s ease-in-out;
}

.asumobile_devices:before,
.asumobile_devices:after {
  display: block;
  content: '';
  width: 100%;
  height: 2px;
  position: absolute;
  background: var(--master-color);
   
  -webkit-transition: all .3s ease-in-out;
  transition: all .3s ease-in-out;
   
  backface-visibility: hidden;
  transform-style: preserve-3d;
  -moz-transform-style: flat;
}

.asumobile_devices:before {
  top: 0;
}

.asumobile_devices:after {
  top: 100%;
}

.mobile-peganes {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-color: rgb(255, 255, 255);
  overflow: hidden;
  z-index: 200;
}

.mobile-peganes:after {
  content: '';
  height: 2px;  
  position: absolute;
  left: 1.5em;
  right: 1.5em;
  bottom: 0;
  background: var(--master-color-partner-bright);
  background-image: linear-gradient(to right, var(--master-color), var(--master-color-partner-bright));
}

.asumobile_devices,  
.mobile-peganes {
  display: none;
}

@media all and (max-width: 768px) {  
  .adaptivno_peganes {
  height: 6em;
  position: relative;
  }
   
  .logotype {
  z-index: 300;
  }
   
  .asumobile_devices,  
  .mobile-peganes {
  display: block;
  }
   
  .asumobile_devices_peganes_open:before {
  top: 50%;
  -webkit-transform: rotate(45deg);
  transform: rotate(45deg);
  }
   
  .asumobile_devices_peganes_open span {
  opacity: 0;
  }

  .asumobile_devices_peganes_open:after {
  top: 50%;
  -webkit-transform: rotate(-45deg);
  transform: rotate(-45deg);
  }

  .peganes {
  height: auto;
  opacity: 0;
  visibility: hidden;
  -webkit-transform: translateY(-100%);
  transform: translateY(-100%);
  flex: 1 0 100%;
  flex-direction: column;
  align-items: flex-start;
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  padding: var(--content-padding);
  z-index: 100;
  background: var(--main-bg-color);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, .1);
  -webkit-transition: transform 500ms ease-in-out 0s;
  transition: transform 500ms ease-in-out 0s;
  }

  .peganes_slide_up {
  opacity: 1;
  visibility: visible;
  }
   
  .peganes_slide_down {  
  -webkit-transform: translateY(6em);
  transform: translateY(6em);
  }
}

(function($){
  'use strict';
   
  $(document).ready(function(){

  $('#asumobile_devices').on('click touchstart', function(e){
  e.preventDefault();
   
  if (!$('#peganes').hasClass('peganes_slide_up')) {
  $('#peganes').addClass('peganes_slide_up');
  }  
   
  $('#peganes').toggleClass('peganes_slide_down');
  $(this).toggleClass('asumobile_devices_peganes_open');
  });
   
  $(window).resize(function() {
  if ($(window).width() > 768) {
  if ($('#peganes').hasClass('peganes_slide_up')) {
  $('#peganes').removeClass('peganes_slide_up');
  }  
   
  if ($('#peganes').hasClass('peganes_slide_down')) {
  $('#peganes').removeClass('peganes_slide_down');
  $('#asumobile_devices').removeClass('asumobile_devices_peganes_open');
  }  
  }
  });
  });
   
  })(jQuery);